Yosemite fire 'poses every challenge there can be'

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In this undated photo provided by the U.S. Forest Service, the Rim Fire burns near Groveland Ranger Station in Groveland, Calif. The wildfire outside Yosemite National Park — one of more than 50 major brush blazes burning across the western U.S. — more than tripled in size overnight and still threatens about 2,500 homes, hotels and camp buildings. Fire officials said the blaze burning in remote, steep terrain had grown to more than 84 square miles and was only 2 percent contained on Thursday, down from 5 percent a day earlier. (AP Photo/U.S. Forest Service)